Organic garbage and sludge mixed solid fuel and preparation method thereof

[0015] The preparation process of the present invention involves three stages of raw material preparation, forming and consolidation.

[0016] The preparation of raw materials includes drying, crushing and mixing of raw materials. Due to the high moisture content of the collected domestic waste, in order to meet the moisture requirements of the molding fuel, the organic waste, which has removed heavy metals, large bricks, tiles, and other inorganic components, is dried or naturally air-dried and dehydrated, and its moisture content is controlled at 4 %~8%; then the pulverized coal and dried domestic garbage are crushed to 3mm~10mm particles by ordinary crushing machinery; then the garbage particles, coal pulverized coal, sludge, combustion aid, desulfurization and dechlorination agent are in an appropriate proportion Fully mixing, in order to make the surface of the raw material particles evenly wetted by the sludge, covering the surface of the garbage and coal particles, to achieve the best bonding effect, and to make the combustion-supporting agent, desulfurization and dechlorination agent uniformly distributed, and facilitate the molding of the raw materials. The moisture content is 8% to 12%.

[0017] The molding process is the second stage. After the prepared raw materials are kneaded mechanically or manually, they are fed into the molding machine at room temperature and pressure (molding pressure: 1961~3432N/cm 2 ) Compress the solid fuel product into the desired shape.

[0018] The third stage is the consolidation process, and the molded sample is naturally dried to a moisture content of 5% to 15%.

[0019] During the preparation of the solution of the present invention, the provided garbage raw materials only need to pick out heavy metals, large brick slag, tiles and other inorganic components, which can be easily solved manually or mechanically, and the main component is organic garbage. There is no need to separate the waste plastics by heating and polycondensation, and there is no need for pyrolysis or dry distillation and carbonization during drying. Only natural drying can meet the preparation conditions. The increase in the proportion of high calorific value combustibles that are difficult to handle due to waste plastics and other garbage disposal methods effectively solves the fundamental problem of low calorific value garbage components hindering the increase in the calorific value of the finished fuel. High combustible components can save a lot of fuel or coal. The sludge is a water-based binder, which has good cohesive force and is easy to uniformly knead. The solid fuel is easy to form and operate at room temperature and pressure, and uses general molding. Products can be made by machinery for widespread use by residents and industries. Therefore, the operation of this invention is very simple in the raw material preparation process, forming and consolidation process, and the fuel can be fully burned without SO 2 The secondary pollution caused by polluting gases such as HCl and HCl.

[0020]The average low calorific value of urban waste in my country is only about 600kcal/kg, and its own heat energy is not enough to burn. It is necessary to increase the precipitation (heat) value of the primary waste or introduce economical measures such as external heat energy that is several times the heat value of the waste itself. The garbage burns stably and meets the requirements of economy and environmental protection. The present invention provides solid fuel that can make full use of organic combustible garbage and sludge (sludge from urban sewage treatment plants) through raw material preparation, molding, and consolidation processes, and a preparation method thereof. The mechanical properties of the product provided by the invention are , Combustion characteristics and thermal stability have reached the technical indicators of briquette.

[0021] The present invention has conducted experiments on the combustion characteristics, thermal stability, compressive strength, drop strength, water immersion strength, re-drying strength and other mechanical performance indicators of the fuel through examples.

[0022] [Example 1]

[0023] After drying, the organic garbage particles, sludge, and coal particles with a moisture content of 4% to 8% are mixed in a ratio of 1:1:2, and the combustion-supporting agent MnO is added. 2 The content is 0.18%, the desulfurization and dechlorination agent CaO content is 0.90%, and the mixture is evenly mixed to keep the moisture content at 8%-12%; then it is kneaded and processed into a solid fuel product with a moisture content of 5%-15%. . The "Industrial Briquette Cold Compressive Strength Measurement Method" (MT/T748-1997) is used to determine the compressive strength of the solid fuel. The compressive strength of the solid fuel is determined to be in the range of 167.2620kPa to 207.0788kPa, with a reliability of 95%.

[0024] [Example 2]

[0025] After drying, the organic garbage particles, coal particles, and sludge with a moisture content of 4% to 8% are mixed in a ratio of 2:1:1, and the combustion-supporting agent MnO is added. 2 The content is 0.17%, the CaO content of the desulfurization and dechlorination agent is 1.20%, and the mixture is evenly mixed to keep the moisture content at 8%-12%; then it is kneaded and processed into a solid fuel product with a moisture content of 5% to 15%. . After immersing the shaped solid fuel product in water (at room temperature) for 24 hours, the "Industrial Coal Briquette" (MT/T749-1997) is used to determine the water immersion strength of the solid fuel. The immersion strength of solid fuel is in the range of 18.74458kPa to 23.484038kPa, and the reliability is 95%.